David Haye (c.) raises his belt trophy after winning the WBO International and WBA Intercontinental Heavyweight Championship fight at the West Ham football stadium in east London. Photo: AFP/Getty Images

LONDON — David Haye knocked out Dereck Chisora in the fifth round of their all-British heavyweight grudge fight at Upton Park on Saturday.

Five months after they brawled in Munich at a news conference, Haye put Chisora down for good with a left hook, but Haye (26-2, 24 KOs) was coming under severe pressure until the knockout in an exciting fight before 30,000 spectators.

The fight panned out as expected. Former world cruiserweight and heavyweight champ Haye had speed and a harder punch, while Chisora (15-4, 9 KOs) used his extra 37 pounds to crowd Haye and land threatening blows.

They continued hitting after the bell in the second and third rounds, and Chisora avoided trouble in the fourth when Haye let up. In the decisive round, Chisora survived an eight count but another Haye left hook dropped him and referee Luis Pabon waved it all over.

No world titles were at stake in the scheduled 10-rounder, which was sanctioned by the Luxembourg federation because the British Boxing Board of Control wouldn’t license either fighter after their shameful antics in Munich.

The mutual dislike between them helped to attract large crowd — more than attended the Lennox Lewis-Frank Bruno heavyweight title bout in 1993.